Utomo, Muhammad Nur, Eddy Tungadi, and Widya Khartika. “Enhancing Web Performance for E-Learning Platform Using Content Delivery Network (CDN) and Varnish Cache”. Journal of Information Systems and Informatics 7, no. 1 (March 28, 2025): 831-847. Accessed December 20, 2025. https://journal-isi.org.adsii.or.id/index.php/isi/article/view/993.